<template>
	<view class="u-wrap">
		<view class="u-search-box">
			<view class="u-search-inner">
				<u-icon name="search" color="#909399" :size="28"></u-icon>
				<u-input class="u-search-text" type="text" height="50" placeholder="搜商品名称" />
			</view>
		</view>
		<view class="u-menu-wrap">
			<scroll-view scroll-y scroll-with-animation class="u-tab-view menu-scroll-view" :scroll-top="scrollTop"
				:scroll-into-view="itemId">
				<view v-for="(item,index) in tabbar" :key="index" class="u-tab-item"
					:class="[current == index ? 'u-tab-item-active' : '']" @tap.stop="swichMenu(index)">
					<text class="u-line-1">{{item.name}}</text>
				</view>
			</scroll-view>
			<scroll-view :scroll-top="scrollRightTop" scroll-y scroll-with-animation class="right-box"
				@scroll="rightScroll">
				<view class="page-view">
					<view class="class-item" :id="'item' + index" v-for="(item , index) in tabbar" :key="index">
						<view class="item-title">
							<text>{{item.name}}</text>
						</view>
						<view class="item-container">
							<view class="thumb-box" v-for="(item1, index1) in item.children" :key="index1">
								<image class="item-menu-image"
									:src="'https://zhy-demo.oss-cn-hangzhou.aliyuncs.com/upload/'+item1.icon" @click="toCategory(item1.id)"></image>
								<view class="item-menu-name">{{item1.name}}</view>
							</view>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>
<script>
	export default {
		data() {
			return {
				scrollTop: 0, //tab标题的滚动条位置
				oldScrollTop: 0,
				current: 0, // 预设当前项的值
				menuHeight: 0, // 左边菜单的高度
				menuItemHeight: 0, // 左边菜单item的高度
				itemId: '', // 栏目右边scroll-view用于滚动的id
				tabbar: [{
						"id": "63944439e7f27c000136308e",
						"createTime": "2019-12-10 18:57:57",
						"createBy": 1,
						"modifyTime": "2021-02-04 16:27:45",
						"modifyBy": 1,
						"name": "手机",
						"url": "",
						"icon": "1504d5bd-7196-4a93-a7fb-0145e3b37a1a.png",
						"pid": null,
						"descript": null,
						"isDelete": false,
						"showIndex": true,
						"sort": 1,
						"bannerList": [{
								"id": 1,
								"createTime": "2019-03-09 16:29:03",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"url": null,
								"title": "红米Rote8,打开外部链接",
								"type": "index",
								"idFile": "75b1e658-161e-4b12-83b0-abd2c1bead39.jpg",
								"page": "goods",
								"param": "{\"id\":2}"
							},
							{
								"id": 2,
								"createTime": "2019-03-09 16:29:03",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"url": null,
								"title": "红米8A",
								"type": "index",
								"idFile": "cfd733e0-4a8a-4b87-8f30-fb909025c647.jpg",
								"page": "goods",
								"param": "{\"id\":1}"
							},
							{
								"id": 3,
								"createTime": "2019-03-09 16:29:03",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"url": null,
								"title": "打开外部链接",
								"type": "index",
								"idFile": "2ba1e87f-f04e-40b5-8d99-63e035a9d752.jpg",
								"page": "https://microapp.gitee.io/linjiashop",
								"param": null
							}
						],
						"children": [{
								"id": "639444f7daf2ed00016f504f",
								"createTime": "2021-02-04 17:32:34",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "小米手机数字",
								"url": null,
								"icon": "1504d5bd-7196-4a93-a7fb-0145e3b37a1a.png",
								"pid": 1,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 1,
								"bannerList": null,
								"children": null,
								"label": "小米手机数字"
							},
							{
								"id": "63945416e7f27c0001389e48",
								"createTime": "2021-02-05 22:17:15",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "小米MIX",
								"url": null,
								"icon": "ee11c501-5216-4edb-b586-6c5bb0b16683.png",
								"pid": 1,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 2,
								"bannerList": null,
								"children": null,
								"label": "小米MIX"
							},
							{
								"id": "6394456188f51200012dfad3",
								"createTime": "2021-02-04 17:32:34",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "黑鲨手机",
								"url": null,
								"icon": "68187341-38a0-4fdb-82b1-a37c1ac0fa53.png",
								"pid": 1,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 3,
								"bannerList": null,
								"children": null,
								"label": "黑鲨手机"
							},
							{
								"id": "6394453326e817000138528e",
								"createTime": "2021-02-04 17:32:34",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "Redmi Note",
								"url": null,
								"icon": "ee11c501-5216-4edb-b586-6c5bb0b16683.png",
								"pid": 1,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 3,
								"bannerList": null,
								"children": null,
								"label": "Redmi Note"
							},
							{
								"id": "6394547fc7989d0001f81223",
								"createTime": "2021-02-05 22:17:15",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "Redmi K",
								"url": null,
								"icon": "68187341-38a0-4fdb-82b1-a37c1ac0fa53.png",
								"pid": 1,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 4,
								"bannerList": null,
								"children": null,
								"label": "Redmi K"
							},
							{
								"id": "639454b2a89937000104bbaa",
								"createTime": "2021-02-05 22:17:15",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "Redmi X",
								"url": null,
								"icon": "1504d5bd-7196-4a93-a7fb-0145e3b37a1a.png",
								"pid": 1,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 5,
								"bannerList": null,
								"children": null,
								"label": "Redmi X"
							},
							{
								"id": "639454e7188fab0001e4e92f",
								"createTime": "2021-02-05 22:17:15",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "Redmi数字",
								"url": null,
								"icon": "ee11c501-5216-4edb-b586-6c5bb0b16683.png",
								"pid": 1,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 6,
								"bannerList": null,
								"children": null,
								"label": "Redmi数字"
							}
						],
						"label": "手机"
					},
					{
						"id": "6394589de7f27c0001395a36",
						"createTime": "2019-12-10 18:57:57",
						"createBy": 1,
						"modifyTime": null,
						"modifyBy": null,
						"name": "电视",
						"url": null,
						"icon": "217c2663-0725-45cd-a091-05a4e9f29f92.png",
						"pid": null,
						"descript": null,
						"isDelete": false,
						"showIndex": true,
						"sort": 2,
						"bannerList": [{
							"id": 6,
							"createTime": "2019-03-09 16:29:03",
							"createBy": 1,
							"modifyTime": null,
							"modifyBy": null,
							"url": null,
							"title": "打开外部链接",
							"type": "product",
							"idFile": "14f9ce27-f133-4321-aeb5-aed470b794d6.jpg",
							"page": "goods",
							"param": "{\"id\":11}"
						}],
						"children": [{
								"id": "63945900c7989d0001f8da07",
								"createTime": "2021-02-04 17:32:34",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "32-40英寸",
								"url": null,
								"icon": "892302d5-e4a5-4bad-a130-92b74ad37e6e.png",
								"pid": 2,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 1,
								"bannerList": null,
								"children": null,
								"label": "32-40英寸"
							},
							{
								"id": "63945932b653d60001c04759",
								"createTime": "2021-02-04 17:32:34",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "43英寸",
								"url": null,
								"icon": "217c2663-0725-45cd-a091-05a4e9f29f92.png",
								"pid": 2,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 2,
								"bannerList": null,
								"children": null,
								"label": "43英寸"
							},
							{
								"id": "6394596f188fab0001e5a732",
								"createTime": "2021-02-05 22:17:15",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "49-50英寸",
								"url": null,
								"icon": "892302d5-e4a5-4bad-a130-92b74ad37e6e.png",
								"pid": 2,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 3,
								"bannerList": null,
								"children": null,
								"label": "49-50英寸"
							},
							{
								"id": "639459b11e4b66000121032a",
								"createTime": "2021-02-05 22:17:15",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "55-60英寸",
								"url": null,
								"icon": "217c2663-0725-45cd-a091-05a4e9f29f92.png",
								"pid": 2,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 4,
								"bannerList": null,
								"children": null,
								"label": "55-60英寸"
							},
							{
								"id": "639459d526e81700013b97bd",
								"createTime": "2021-02-05 22:17:15",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "65-98英寸",
								"url": null,
								"icon": "892302d5-e4a5-4bad-a130-92b74ad37e6e.png",
								"pid": 2,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 5,
								"bannerList": null,
								"children": null,
								"label": "65-98英寸"
							},
							{
								"id": "63945a0526b3d80001068dd9",
								"createTime": "2021-02-05 22:17:15",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "激光投影电视",
								"url": null,
								"icon": "217c2663-0725-45cd-a091-05a4e9f29f92.png",
								"pid": 2,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 6,
								"bannerList": null,
								"children": null,
								"label": "激光投影电视"
							},
							{
								"id": "63945a33f1492c00011a1bd0",
								"createTime": "2021-02-05 22:17:15",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "82英寸",
								"url": null,
								"icon": "217c2663-0725-45cd-a091-05a4e9f29f92.png",
								"pid": 2,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 7,
								"bannerList": null,
								"children": null,
								"label": "82英寸"
							},
							{
								"id": "63945a5326b3d80001069970",
								"createTime": "2021-02-05 22:17:15",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "65英寸OLED",
								"url": null,
								"icon": "892302d5-e4a5-4bad-a130-92b74ad37e6e.png",
								"pid": 2,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 8,
								"bannerList": null,
								"children": null,
								"label": "65英寸OLED"
							}
						],
						"label": "电视"
					},
					{
						"id": "63945b90daf2ed000172f09d",
						"createTime": "2019-12-10 18:57:57",
						"createBy": 1,
						"modifyTime": null,
						"modifyBy": null,
						"name": "笔记本",
						"url": null,
						"icon": "6159be2e-5180-404d-96e0-b7d2eb3a9c32.png",
						"pid": null,
						"descript": null,
						"isDelete": false,
						"showIndex": true,
						"sort": 3,
						"bannerList": [{
								"id": 4,
								"createTime": "2019-03-09 16:29:03",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"url": null,
								"title": "不打开链接",
								"type": "product",
								"idFile": "00950b78-0fc6-4e88-b663-07dc46a2b6df.jpg",
								"page": "goods",
								"param": "{\"id\":15}"
							},
							{
								"id": 5,
								"createTime": "2019-03-09 16:29:03",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"url": null,
								"title": "打打开站内链接",
								"type": "product",
								"idFile": "8974ee52-c261-440a-84d3-8f8c1bd43a6a.jpg",
								"page": "goods",
								"param": "{\"id\":16}"
							}
						],
						"children": [{
								"id": "63945c00f1492c00011a64d8",
								"createTime": "2021-02-04 17:32:34",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "小米笔记本Pro",
								"url": null,
								"icon": "6159be2e-5180-404d-96e0-b7d2eb3a9c32.png",
								"pid": 3,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 1,
								"bannerList": null,
								"children": null,
								"label": "小米笔记本Pro"
							},
							{
								"id": "63945c1ee7f27c000139f498",
								"createTime": "2021-02-04 17:32:34",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "小米笔记本Air",
								"url": null,
								"icon": "c5605ddf-3944-4254-981e-cfc968d5fbe3.png",
								"pid": 3,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 2,
								"bannerList": null,
								"children": null,
								"label": "小米笔记本Air"
							},
							{
								"id": "63945c54daf2ed000173110a",
								"createTime": "2021-02-05 22:17:15",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "小米游戏本",
								"url": null,
								"icon": "6159be2e-5180-404d-96e0-b7d2eb3a9c32.png",
								"pid": 3,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 3,
								"bannerList": null,
								"children": null,
								"label": "小米游戏本"
							},
							{
								"id": "63945c7326b3d8000106ef34",
								"createTime": "2021-02-05 22:17:15",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "RedmiBook Air",
								"url": null,
								"icon": "c5605ddf-3944-4254-981e-cfc968d5fbe3.png",
								"pid": 3,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 4,
								"bannerList": null,
								"children": null,
								"label": "RedmiBook Air"
							},
							{
								"id": "63945c9bb653d60001c0d832",
								"createTime": "2021-02-05 22:17:15",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "RedmiBook 16",
								"url": null,
								"icon": "6159be2e-5180-404d-96e0-b7d2eb3a9c32.png",
								"pid": 3,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 5,
								"bannerList": null,
								"children": null,
								"label": "RedmiBook 16"
							},
							{
								"id": "63945cc6f1492c00011a820a",
								"createTime": "2021-02-05 22:17:15",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "RedmiBook 14",
								"url": null,
								"icon": "c5605ddf-3944-4254-981e-cfc968d5fbe3.png",
								"pid": 3,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 6,
								"bannerList": null,
								"children": null,
								"label": "RedmiBook 14"
							},
							{
								"id": "63945ce8ff2a54000173ae99",
								"createTime": "2021-02-05 22:17:15",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "RedmiBook 13",
								"url": null,
								"icon": "6159be2e-5180-404d-96e0-b7d2eb3a9c32.png",
								"pid": 3,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 7,
								"bannerList": null,
								"children": null,
								"label": "RedmiBook 13"
							},
							{
								"id": "63945d0e6742b7000117498b",
								"createTime": "2021-02-05 22:17:15",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "RedmiBook G游戏本",
								"url": null,
								"icon": "c5605ddf-3944-4254-981e-cfc968d5fbe3.png",
								"pid": 3,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 8,
								"bannerList": null,
								"children": null,
								"label": "RedmiBook G游戏本"
							}
						],
						"label": "笔记本"
					},
					{
						"id": "63945ea4f1492c00011ad4b6",
						"createTime": "2019-12-10 18:57:57",
						"createBy": 1,
						"modifyTime": null,
						"modifyBy": null,
						"name": "家电",
						"url": null,
						"icon": "83e9552f-fe2f-4c51-8cff-744dc7a93d65.png",
						"pid": null,
						"descript": null,
						"isDelete": false,
						"showIndex": true,
						"sort": 4,
						"bannerList": [{
							"id": 7,
							"createTime": "2019-03-09 16:29:03",
							"createBy": 1,
							"modifyTime": null,
							"modifyBy": null,
							"url": null,
							"title": "不打开链接",
							"type": "solution",
							"idFile": "0cbeb359-39de-42a9-9d19-96e9887a819e.jpg",
							"page": "http://flash-mobile.enilu.cn/#/index",
							"param": null
						}],
						"children": [{
								"id": "6394741fd4fe2f0001742bdc",
								"createTime": "2021-02-04 17:32:34",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "冰箱",
								"url": null,
								"icon": "8179f929-6c32-4eb2-9169-24fd448cdef9.png",
								"pid": 4,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 1,
								"bannerList": null,
								"children": null,
								"label": "冰箱"
							},
							{
								"id": "6394744190b26d0001a514c1",
								"createTime": "2021-02-04 17:32:34",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "壁挂空调",
								"url": null,
								"icon": "83e9552f-fe2f-4c51-8cff-744dc7a93d65.png",
								"pid": 4,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 2,
								"bannerList": null,
								"children": null,
								"label": "壁挂空调"
							},
							{
								"id": "6394746626e81700013fd214",
								"createTime": "2021-02-04 17:32:34",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "立式空调",
								"url": null,
								"icon": "83e9552f-fe2f-4c51-8cff-744dc7a93d65.png",
								"pid": 4,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 3,
								"bannerList": null,
								"children": null,
								"label": "立式空调"
							},
							{
								"id": "6394748989171400013636d1",
								"createTime": "2021-02-05 22:17:15",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "滚筒洗衣机",
								"url": null,
								"icon": "7c4fe3d6-7618-4365-ae97-63dd6e6fcfde.png",
								"pid": 4,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 4,
								"bannerList": null,
								"children": null,
								"label": "滚筒洗衣机"
							},
							{
								"id": "639474aeb653d60001c4bb28",
								"createTime": "2021-02-05 22:17:15",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "波轮洗衣机",
								"url": null,
								"icon": "7c4fe3d6-7618-4365-ae97-63dd6e6fcfde.png",
								"pid": 4,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 5,
								"bannerList": null,
								"children": null,
								"label": "波轮洗衣机"
							},
							{
								"id": "639474ca88f512000135a52c",
								"createTime": "2021-02-05 22:17:15",
								"createBy": 1,
								"modifyTime": null,
								"modifyBy": null,
								"name": "干衣机",
								"url": null,
								"icon": "7c4fe3d6-7618-4365-ae97-63dd6e6fcfde.png",
								"pid": 4,
								"descript": null,
								"isDelete": false,
								"showIndex": false,
								"sort": 6,
								"bannerList": null,
								"children": null,
								"label": "干衣机"
							}
						],
						"label": "家电"
					}
				],
				menuItemPos: [],
				arr: [],
				scrollRightTop: 0, // 右边栏目scroll-view的滚动条高度
				timer: null, // 定时器

			}
		},
		onLoad() {
			this.init()
		},
		methods: {
			init() {
				// this.$u.get('category/list').then(res => {
				// 	this.tabbar = res
				// 	this.getMenuItemTop()
				// })
				this.getMenuItemTop()
			},
			// toSearch() {
			// 	this.$u.route({
			// 		url: '/pages/shop/search'
			// 	})
			// },
			toCategory(category) {
				this.$u.route({
					url: 'pages/grid/list',
					params: {
						idCategory: category
					}
				});
				console.log(category)
			},
			// 点击左边的栏目切换
			async swichMenu(index) {
				if (this.arr.length == 0) {
					await this.getMenuItemTop()
				}
				if (index == this.current) return
				this.scrollRightTop = this.oldScrollTop
				this.$nextTick(function() {
					this.scrollRightTop = this.arr[index];
					this.current = index
					this.leftMenuStatus(index)
				})
			},
			// 获取一个目标元素的高度
			getElRect(elClass, dataVal) {
				new Promise((resolve, reject) => {
					const query = uni.createSelectorQuery().in(this);
					query.select('.' + elClass).fields({
						size: true
					}, res => {
						// 如果节点尚未生成，res值为null，循环调用执行
						if (!res) {
							setTimeout(() => {
								this.getElRect(elClass)
							}, 10)
							return
						}
						this[dataVal] = res.height
						resolve()
					}).exec()
				})
			},
			// 观测元素相交状态
			async observer() {
				this.tabbar.map((val, index) => {
					let observer = uni.createIntersectionObserver(this);
					// 检测右边scroll-view的id为itemxx的元素与right-box的相交状态
					// 如果跟.right-box底部相交，就动态设置左边栏目的活动状态
					observer.relativeTo('.right-box', {
						top: 0
					}).observe('#item' + index, res => {
						if (res.intersectionRatio > 0) {
							let id = res.id.substring(4)
							this.leftMenuStatus(id)
						}
					})
				})
			},
			// 设置左边菜单的滚动状态
			async leftMenuStatus(index) {
				this.current = index
				// 如果为0，意味着尚未初始化
				if (this.menuHeight == 0 || this.menuItemHeight == 0) {
					await this.getElRect('menu-scroll-view', 'menuHeight')
					await this.getElRect('u-tab-item', 'menuItemHeight')
				}
				// 将菜单活动item垂直居中
				this.scrollTop = index * this.menuItemHeight + this.menuItemHeight / 2 - this.menuHeight / 2
			},
			// 获取右边菜单每个item到顶部的距离
			getMenuItemTop() {
				new Promise(resolve => {
					let selectorQuery = uni.createSelectorQuery()
					selectorQuery.selectAll('.class-item').boundingClientRect((rects) => {
						// 如果节点尚未生成，rects值为[](因为用selectAll，所以返回的是数组)，循环调用执行
						if (!rects.length) {
							setTimeout(() => {
								this.getMenuItemTop()
							}, 10)
							return
						}
						rects.forEach((rect) => {
							// 这里减去rects[0].top，是因为第一项顶部可能不是贴到导航栏(比如有个搜索框的情况)
							this.arr.push(rect.top - rects[0].top)
							resolve()
						})
					}).exec()
				})
			},
			// 右边菜单滚动
			async rightScroll(e) {
				this.oldScrollTop = e.detail.scrollTop
				if (this.arr.length == 0) {
					await this.getMenuItemTop()
				}
				if (this.timer) return;
				if (!this.menuHeight) {
					await this.getElRect('menu-scroll-view', 'menuHeight')
				}
				setTimeout(() => { // 节流
					this.timer = null
					// scrollHeight为右边菜单垂直中点位置
					let scrollHeight = e.detail.scrollTop + this.menuHeight / 2
					for (let i = 0; i < this.arr.length; i++) {
						let height1 = this.arr[i]
						let height2 = this.arr[i + 1]
						// 如果不存在height2，意味着数据循环已经到了最后一个，设置左边菜单为最后一项即可
						if (!height2 || scrollHeight >= height1 && scrollHeight < height2) {
							this.leftMenuStatus(i)
							return
						}
					}
				}, 10)
			}
		}
	}
</script>

<style lang="scss" scoped>
	.u-wrap {
		height: calc(100vh);
		/* #ifdef H5 */
		height: calc(100vh - var(--window-top));
		/* #endif */
		display: flex;
		flex-direction: column;
	}

	.u-search-box {
		padding: 10rpx 30rpx;
	}

	.u-menu-wrap {
		flex: 1;
		display: flex;
		overflow: hidden;
	}

	.u-search-inner {
		background-color: rgb(234, 234, 234);
		border-radius: 100rpx;
		display: flex;
		align-items: center;
		padding: 10rpx 16rpx;
	}

	.u-search-text {
		font-size: 24rpx;
		color: $u-tips-color;
		margin-left: 10rpx;
	}

	.u-tab-view {
		width: 200rpx;
		height: 100%;
	}

	.u-tab-item {
		height: 110rpx;
		background: #f6f6f6;
		box-sizing: border-box;
		display: flex;
		align-items: center;
		justify-content: center;
		font-size: 26rpx;
		color: #444;
		font-weight: 400;
		line-height: 1;
	}

	.u-tab-item-active {
		position: relative;
		color: #000;
		font-size: 30rpx;
		font-weight: 600;
		background: #fff;
	}

	.u-tab-item-active::before {
		content: "";
		position: absolute;
		border-left: 4px solid yellow;
		height: 32rpx;
		left: 0;
		top: 39rpx;
	}

	.u-tab-view {
		height: 100%;
	}

	.right-box {
		background-color: rgb(250, 250, 250);
	}

	.page-view {
		padding: 16rpx;
	}

	.class-item {
		margin-bottom: 30rpx;
		background-color: #fff;
		padding: 16rpx;
		border-radius: 8rpx;
	}

	.class-item:last-child {
		min-height: 100vh;
	}

	.item-title {
		font-size: 26rpx;
		color: $u-main-color;
		font-weight: bold;
	}

	.item-menu-name {
		font-weight: normal;
		font-size: 24rpx;
		color: $u-main-color;
	}

	.item-container {
		display: flex;
		flex-wrap: wrap;
	}

	.thumb-box {
		width: 33.333333%;
		display: flex;
		align-items: center;
		justify-content: center;
		flex-direction: column;
		margin-top: 20rpx;
	}

	.item-menu-image {
		width: 120rpx;
		height: 120rpx;
	}
</style>
